Hosta

Thomas Muster defeated Andrei Chesnokov in the final, 6–1, 6–3, 6–1 to win the men's singles tennis title at the 1990 Italian Open.

Alberto Mancini was the defending champion, but lost to Chesnokov in the quarterfinals.

Seeds

Draw

Key

Finals

	Semifinals							Final
	8	Andrei Chesnokov	6	6	7
	4	Emilio Sánchez	7	4	6
								8	Andrei Chesnokov	1	3	1
								10	Thomas Muster	6	6	6
	3	Andrés Gómez	7	4	6
	10	Thomas Muster	5	6	7

Top half

Section 1

	First round							Second round							Third round							Quarterfinals
	1	B Gilbert	1	6	6
		J Pugh	6	4	4			1	B Gilbert	7	6
		D Wheaton	2	3					L Mattar	6	4
		L Mattar	6	6											1	B Gilbert	2	1
	Q	T Champion	2	4											16	A Mancini	6	6
	SE	H Leconte	6	6				SE	H Leconte	4	4
	LL	C Miniussi	6	6	4			16	A Mancini	6	6
	16	A Mancini	4	7	6																	16	A Mancini	6	0
	9	J Courier	6	1	6																	8	A Chesnokov	7	6
		F Davín	1	6	4			9	J Courier	6	6
		J Yzaga	6	4	6				J Yzaga	3	4
		J Sánchez	4	6	4										9	J Courier	6	6	3
	Q	F Mordegan	6	5	2										8	A Chesnokov	4	7	6
		P Canè	4	7	6				P Canè	6	3	3
		J Arias	6	3				8	A Chesnokov	4	6	6
	8	A Chesnokov	7	6

Section 2

	First round							Second round							Third round							Quarterfinals
	4	E Sánchez	6	6
		A Sznajder	2	1				4	E Sánchez	4	6	6
		T Witsken	4	6	4				M Filippini	6	1	2
		M Filippini	6	3	6										4	E Sánchez	6	6
		T Carbonell	6	6											13	J Svensson	3	2
	WC	G Pozzi	1	3					T Carbonell	3	1
	Q	L Jensen	2	6	2			13	J Svensson	6	6
	13	J Svensson	6	3	6																	4	E Sánchez	7	6
	12	G Pérez Roldán	6	6	6																	12	G Pérez Roldán	6	2
		R Agénor	7	2	4			12	G Pérez Roldán	6	6
		R Reneberg	6	3	5				J-P Fleurian	3	4
		J-P Fleurian	4	6	7										12	G Pérez Roldán	6	6
	Q	R Furlan	6	6											6	M Jaite	4	3
		M Střelba	3	3				Q	R Furlan	4	4
	Q	D Leppen	3	1				6	M Jaite	6	6
	6	M Jaite	6	6

Bottom half

Section 3

	First round							Second round							Third round							Quarterfinals
	5	J Berger	3	6	6
		A Mansdorf	6	1	0			5	J Berger	4	4
		O Camporese	6	6					O Camporese	6	6
	Q	A Boetsch	4	4												O Camporese	6	6
	WC	C Pistolesi	3	6												P Haarhuis	4	1
	Q	M Cierro	6	7				Q	M Cierro	4	4
		P Haarhuis	6	6					P Haarhuis	6	6
	LL	S Casal	1	4																			O Camporese	1	2
	14	M Gustafsson	3	6	6																	3	A Gómez	6	6
		J Arrese	6	4	3			14	M Gustafsson	6	6	6
	WC	S Pescosolido	6	6				WC	S Pescosolido	4	7	2
		L Duncan	2	3											14	M Gustafsson	4	5
		C Motta	3	2											3	A Gómez	6	7
	WC	D Nargiso	6	6				WC	D Nargiso	6	4
		Y Noah	1	7	3			3	A Gómez	7	6
	3	A Gómez	6	6	6

Section 4

	First round							Second round							Third round							Quarterfinals
	7	M Chang	3	3
		J Gunnarsson	6	6					J Gunnarsson	6	6
		M Šrejber	6	7	3				S Bruguera	4	2
		S Bruguera	7	6	6											J Gunnarsson	3	2
		N Kroon	3	3											10	T Muster	6	6
	WC	A Järryd	6	6				WC	A Järryd	1r
		J Hlasek	3	4				10	T Muster	5
	10	T Muster	6	6																		10	T Muster	6	3	6
	15	P Korda	3	2																			G Forget	2	6	3
		G Forget	6	6					G Forget	6	3	6
		A Volkov	6	1	6				A Volkov	1	6	2
		J Aguilera	3	6	4											G Forget	6	7
	Q	T Theine	4	6	4										2	A Krickstein	4	6
		K Nováček	6	1	6				K Nováček	2	2
		J Grabb	1	3				2	A Krickstein	6	6
	2	A Krickstein	6	6

References

• 1990 Peugeot Italian Open Draw